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Real Estate and Intangible Assets - Summarized Information of Acquisition of Properties (Parenthetical) (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015
Parrish Road [Member] |
Real Estate Properties [Line Items] |
Contingent consideration owed in connection with acquisition of real estate property | $ 700,000 land_AcquisitionOfRealEstatePropertyAdditionalCompensationCommittedUponApprovalOfIncreaseInWaterPermits / us-gaap_RealEstatePropertiesAxis = land_ParrishRoadMember
2015 New Real Estate Activity [Member] |
Real Estate Properties [Line Items] |
Finder's fee | 320,905 land_CreditToIncentiveFee / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember
Direct leasing costs in connection with acquisitions | 2,625 us-gaap_AcquisitionCosts / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember
2015 New Real Estate Activity [Member] | New Tenant Lease Agreement [Member] |
Real Estate Properties [Line Items] |
Direct leasing costs in connection with acquisitions | $ 2,625 us-gaap_AcquisitionCosts / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember

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- Definition Acquisition of real estate property additional compensation committed upon approval of increase in water permits. + References No definition available. + Details
Name: | land_AcquisitionOfRealEstatePropertyAdditionalCompensationCommittedUponApprovalOfIncreaseInWaterPermits
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Credit to incentive fee. + References No definition available. + Details
Name: | land_CreditToIncentiveFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
Name: | us-gaap_AcquisitionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_ParrishRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=land_TwoThousandFifteenNewRealEstateActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |